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Finding the Fourth Proportional to 918.45, 1,377.41 and 485.37

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Solution

The fourth proportional to 918.45, 1,377.41 and 485.37 is: 727.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.45 : 1,377.41 = 485.37 : x
  2. Step 2: Convert to fraction form
    918.45/1,377.41 = 485.37/x
  3. Step 3: Cross multiply
    918.45x = 1,377.41 × 485.37
  4. Step 4: Simplify right side
    918.45x = 668,551.06
  5. Step 5: Solve for x
    x = 668,551.06/918.45
  6. Step 6: Final answer
    x = 727.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.